version 1.1.8.1, 2007/12/26 11:51:12 |
version 1.1.8.2, 2008/01/21 09:40:14 |
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/* $NetBSD$ */ |
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/*- |
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* Copyright (c) 1996, 1997, 1998, 2000 The NetBSD Foundation, Inc. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to The NetBSD Foundation |
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* by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace |
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* Simulation Facility, NASA Ames Research Center. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* This product includes software developed by the NetBSD |
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* Foundation, Inc. and its contributors. |
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* 4. Neither the name of The NetBSD Foundation nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/*- |
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* Copyright (c) 1982, 1987, 1990 The Regents of the University of California. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* William Jolitz. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* @(#)machdep.c 7.4 (Berkeley) 6/3/91 |
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*/ |
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#include <sys/cdefs.h> |
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__KERNEL_RCSID(0, "$NetBSD$"); |
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#include <sys/param.h> |
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#include <sys/systm.h> |
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#include <sys/mutex.h> |
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#include <machine/segments.h> |
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#if !defined(XEN) |
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static kmutex_t idt_lock; |
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struct gate_descriptor *idt; |
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static char idt_allocmap[NIDT]; |
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/* |
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* Allocate an IDT vector slot within the given range. |
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*/ |
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int |
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idt_vec_alloc(int low, int high) |
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{ |
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int vec; |
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mutex_enter(&idt_lock); |
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for (vec = low; vec <= high; vec++) { |
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if (idt_allocmap[vec] == 0) { |
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idt_allocmap[vec] = 1; |
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mutex_exit(&idt_lock); |
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return vec; |
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} |
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} |
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mutex_exit(&idt_lock); |
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return 0; |
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} |
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void |
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idt_vec_reserve(int vec) |
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{ |
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int result = idt_vec_alloc(vec, vec); |
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if (result != vec) { |
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panic("%s: failed to reserve vec %d", __func__, vec); |
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} |
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} |
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void |
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idt_vec_set(int vec, void (*function)(void)) |
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{ |
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/* |
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* Vector should be allocated, so no locking needed. |
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*/ |
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KASSERT(idt_allocmap[vec] == 1); |
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setgate(&idt[vec], function, 0, SDT_SYS386IGT, SEL_KPL, |
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GSEL(GCODE_SEL, SEL_KPL)); |
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} |
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void |
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idt_vec_free(int vec) |
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{ |
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mutex_enter(&idt_lock); |
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unsetgate(&idt[vec]); |
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idt_allocmap[vec] = 0; |
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mutex_exit(&idt_lock); |
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} |
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void |
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idt_init(void) |
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{ |
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mutex_init(&idt_lock, MUTEX_DEFAULT, IPL_NONE); |
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} |
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#endif /* !defined(XEN) */ |